That's just to make things in full picture. It's inconsequential and worthless in the scope of the film. To me, they do not even to explain why machine do that.

That's just to make things in full picture. It's inconsequential and worthless in the scope of the film. To me, they do not even to explain why machine do that. Like so many Japnese manga and anime, they never explain the history, just follow the setup and narrative to explore the human story. I guess Hollywood is not used to that style.